Valve grinding device



May 18, 1954 c. ZIMDARS VALVE GRINDING DEVICE Filed Dec. 16, 1952."

INVENTOR. CLARE NCE Zl M DARS ATTOIPIYEK Patented May 18, 1954 VALVE GRINDING DEVICE Clarence Zimdars, Milwaukee, Wis., assignor of one-half to Louis J.

Hojnacki, Milwaukee, Wis.

Application December 16, 1952, Serial No. 326,226

3 Claims.

My invention relates to toolsand more particularly to a tool for refacing the valve and valve seat in an internal combustion engine or the like.

An object of my invention is to provide a tool that saves time in the performance of the operation of facing valves and valve seats.

Another object of my invention is to provide a means of permitting the facing operationto be performed without removing the valves.

Still another object of my invention is to provide a device of the character described that will perform a dual operation, namely facing the valve and the valve seat at the same time.

A further object of my invention is to provide a device of the character described that requires only the removal of the engine head, to permit access to the valves and seats.

A still further object of my invention is to provide a device of the character described that may be manually or mechanically operated.

It is manifest to anyone familiar with the art of refacing and grinding valve and valve seats in an internal combustion engine, that much time and labor is spent in the disassembly and assembly of the various parts to be processed. With the device specified, illustrated and claimed herein, much of this time and labor is saved and eliminated, for it is only necessary to remove the engine head and tighten the fan belt on the engine. This will permit raising and lowering the valves by revolving the fan, and by placing the device into position, the valves and the valve seats may be refaced or surfaced with a single operation.

Other and further objects of my invention will become more apparent as the description proceeds when taken in conjunction with the drawings in which:

Figure 1 is a perspective view of the device in an assembled position,

Figure 2 is a perspective view of the guide housing,

Figure 3 is a perspective view element,

Figure 4 is a fragmentary cross-sectional view of the device taken from the open portion of the housing, showing the valves and a portion of the cylinder block in phantom,

Figure 5 is a cross-sectional view of the assembled device showing aportion of a valve and a portion of the cylinder block in phantom, and

Figure 6 is a fragmentary cross-sectional view showing the valve anda portion of the grinding element and valve seat, and illustrating the manner in which the abrasive portion of the tool conof the grinding 2 tacts both the valve seat and the inner face of the valve.

Similar characters of reference indicate corresponding parts throughout the several views,

a and referring now to the same, the character l0 shows a circular guide plate arrangement. This may be of a casting or forging, and is provided with a bushing ll extending through its center. The guide is provided with a semi-cylindrical 1 wall l2 forming a housing construction, and this wall I2 is provided with an outwardly extending flange I 3 which may be equipped with a single or plurality of open slots shown as M, The flange i3 is employed when clamping the device into position on top of a cylinder block shown as l5,

by means of a bolt as indicated in phantom in Figure 5 at 15. This bolt would fit into the slot I l. However, the flange and housing may be clamped down in any convenient manner. The cylinder block I 6 is provided with the valve seats I? which may be inserted into the block or may be an integral part thereof. The valve shown as H! is provided with a stem shown as M, and a grinding element shown as 20 fits into the enclosure or housing formed by the guide unit. This grinding element has a shank 2| shown with a square top section 22 extending upward from a circular plate 23 forming the top of the grinding element. The circular plate is provided with a semi-cylindrical vertical wall shown as 2'3 which is tapered at 25, and extends inward to form a bottom plate 26, which plate is also a semicircular contour and is provided with a semicircular open slot 21 which engages the outer peripheral surface of the valve stem l9 when the device is in place.

There is an abrasive surface 28 on the inside of the tapered portion of the wall 25, and another abrasive surface shown as 29 on the outside of the tapered wall shown as 25. This abrasive surface is obviously angularly disposed following the contour of the tapered wall, to fit the angle of the valve l8 and valve seat shown as H.

In operation, it is merely necessary to remove the cylinder head of an internal combustion engine to expose the valve heads. By tightening the fan belt, it will be possible to operate the valves against the tension of the valve springs, thereby raising one valve at a time. The guide housing I2 is then placed on the top flat surface of the engine block 16, which will align it perfectly and by inserting the valve 18 into the open side of the grinding element 26, which is held in position by the shank 2| engaging the bushing II, the open slot 27 will partially surround the valve stem i9, placing the abrasive surface 28 against the face of the valve seat ll. When the fan is revolved, bringing the valve [8 downward, both the face of the valve 18 and the face of the seat I! will be contacted by the abrasive elements 28 and 29 respectively, and when the shank 2! is revolved by either manual effort or by mechanical equipment, the abrasive elements will reface the surfaces of which they came in contact. Obviously, the grinding element 28 may be revolved at any speed, depending upon the type of job being performed, and after the surfaces are ground and refaced, the valve may again be lifted by revolving the fan and the assembled device may be removed and placed in engagement with other valves, one at a time.

While I have shown a specific structure, I do not wish to limit myself to the particular structure shown, for I am fully cognizant of the fact that many changes in the form and configuration of the component parts may be made without affecting their operativeness, and I reserve the right to make such changes without departing from the spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent in the United States is:

l. A device of the character described comprising in combination, a grinding element consisting of a. semi-cylindrical housing open at its side, having a fiat plate at its top, a shank extending from said plate, said housing provided with an angularly disposed semi-circular wall, an abrasive element covering the inner and outer surface of said angular wall, a circular guide member supported at the top of a semi-circular wall, said wall provided with an outwardly extending flange, said guide member provided with an aperture centrally disposed therethrough, said aperture employed as a bearing for the shank of said grinding element when said shank is journaled therein.

. 2. A device of the character described comprising in combination, a grinding element open at its side, a guide member open at its bottom and one side, said guide member provided with a semicircular outwardly extending flange at its bottom, and a circular plate at its top, said circular plate having an aperture centrally disposed therethrough, said grinding element comprising a circular plate at its top, an outwardly extending shaft for engagement with the aperture in the circular top plate of said guide, the wall of said grinding element angularly disposed and equipped with an abrasive element at its inner and outer surface, said angular wall terminating into a bottom plate having a semi-circular open slot, means on top of said shaft integrally formed therewith arranged for engagement with an actuating means for revolving said grinding element within said guide member.

3. A device of the character described comprising in combination, a grinding element and a guide member, both the said grinding element and guide member provided with a circular plate at the top and semi-circular side walls extending downward therefrom, the wall of said guide member provided with an outwardly extending flange at its lower end, the circular plate of said guide member provided with a centrally disposed aperture, said aperture provided with a bushing extending therethrough, the circular plate at the top of said grinding element having an outwardly extending shaft for engagement with the bushing in said guide member, the semicircular side wall of said grinding member being angularly disposed and extending inward, said angular wall provided with an abrasive covering on its inner and outer face, and. a semi-circular bottom plate extending from the lower edge of said semi-circular angular wall of said grinding element, said bottom plate provided with semicircular open slot extending inward from its outer edge.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,216,925 Beagle Feb. 20, 1917 1,702,736 Liberty Feb. 19, 1929 1,793,308 Eckels Feb. 17, 1931 1,824,327 Bueckermann Sept. 22, 1931 1,900,075 Radley Mar. 7, 1933 2,126,789 Lindsey Aug. 16, 1938 2,400,160 Mitzell May 14, 1946 

